Not K Zildjian Istanbul. Not the earlier K Zildjian Constantinople. If there is some currently unknown Turkish manufacturer who was using that trademark that would be news to me. Bill Hartrick (Drumaholic) who did the original work on these called them "Ersatz Old Ks". If you search for Ersatz on this forum you can see some previous discussion.

As steff suggests that trademark is more likely Italian or perhaps German (or maybe some other Country). I don't know much about the German cymbals. I have recorded a number of different presumed Italian cymbals which include things like the star and moon, some sort of Arabic looking script, and sometimes the word Constantinople, in an effort to appear Turkish in origin. But I have not yet got a set of reliable classification rules so you can spot the Ersatz Old Ks. So my Which K Stamp? tool stops short of documenting all the older K Zildjian Constantinople stamps and does not give a complete picture of the Ersatz Old Ks.

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For every expert, there is an equal and opposite expert, but for every fact there is not necessarily an equal and opposite fact (Thomas Sowell, 1995 in The Vision of the Anointed)

I have a cymbal with the same stamp, or, actually, just "Composition," star and crescent and also the letters "WM 1942."
Possibly a marching cymbal from a Wehrmacht band?
It sounds exceptionally terrible and seems to be made of an unusual alloy, like B12 or something.